The exposure reflex mk2 is the pinnacle of lighting technology the reflex technology boosts the light to a massive 2200 lumens but only when you need it then intelligently backs off the power when it is not needed to keep you riding all night the reflex technology boosts the output of the xml leds to a massive 2200 lumens but only when you need exposure39s reflex technology monitors the surroundings to intelligently distribute light power to suit the terrain when climbing reflex gradually